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STOCK PLANS (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of stock option activity

The following table summarizes stock option activity for the year ended December 31, 2017 under all Plans:

		Year Ended December 31,
		2017
		Number of Options			Weighted Average Exercise Price
Balance at beginning of year		1,609,702			$	51.32
Options granted		182,615			85.43
Options exercised		(401,233	)		41.44
Options canceled		(28,636	)		68.18
Balance at end of year		1,362,448			58.45
Exercisable at end of year		952,889			52.57

Weighted average assumptions used for estimating fair value of options granted

The weighted average assumptions for each of the three years ended December 31 were as follows:

		Year Ended December 31,
		2017				2016				2015
Expected volatility		25.77		%		28.86		%		30.73		%
Dividend yield		1.62		%		1.70		%		1.48		%
Risk-free interest rate		1.90		%		1.27		%		1.32		%
Expected option life (years)		4.5				4.5				4.5
Weighted average fair value per option granted during the year		$	17.50			$	12.55			$	16.35

Summary of nonvested stock options

The following table summarizes non-vested stock options for the year ended December 31, 2017:

		Year Ended December 31, 2017
		Number of Options			Weighted Average Fair Value at Grant Date
Balance at beginning of year		458,382			$	14.32
Granted		182,615			17.50
Vested		(205,066	)		14.82
Forfeited		(26,372	)		14.58
Balance at end of year		409,559			15.47

Summary of information about awards outstanding, by exercise price range

The following table summarizes information about awards outstanding as of December 31, 2017:

		Outstanding									Exercisable
Exercise Price Range		Number of Stock Options			Weighted Average Exercise Price				Weighted Average Remaining Life (years)		Number of Stock Options			Weighted Average Exercise Price				Weighted Average Remaining Life (years)
Under $49.99		508,257			$	38.79			3.9		508,257			$	38.79			3.9
$50.00 - $59.99		224,894			58.11				8.1		75,615			58.07				8.1
Over $60.00		629,297			74.45				7.3		369,017			70.43				6.5
		1,362,448							6.2		952,889							5.2

Summary of restricted share award activity

The following table summarizes restricted share award activity for the year ended December 31, 2017 under all Plans:

		Year Ended December 31,
		2017
		Number of Shares			Weighted Average Grant Date Fair Value
Balance at beginning of year		46,159			$	64.65
Shares granted		13,910			89.82
Shares vested		(12,213	)		90.37
Balance at end of year		47,856			71.54

Summary of restricted stock unit activity

The following table summarizes RSU and PSU activity for the year ended December 31, 2017 under all Plans:

		Year Ended December 31,
		2017
		Number of Units			Weighted Average Grant Date Fair Value
Balance at beginning of year		376,784			$	59.75
Units granted		145,245			85.69
Units vested		(71,845	)		49.39
Units forfeited		(31,218	)		66.68
Balance at end of year		418,966			69.98

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Tabular disclosure of the changes in outstanding nonvested restricted stock shares.

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Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

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